Double curtain device

ABSTRACT

A double curtain device wherein a curtain (5) provided with punched patterns (29) is connected at the respective ends with a main winding shaft (2) and auxiliary winding shaft (3) both rotatably provided between right and left supporting cases (1), a balance weight shaft (8) is inserted and held in a folded part (7) of the curatin (5) so as to tension the curtain (5), a joint (9) is slidably fitted to the main winding shaft (2) so that the length of the main winding shaft (2) may be adjustable, said auxiliary winding shaft (3) is formed by fitting a small diameter tube (15) provided with an axial groove (14) cut on one side into a large diameter tube (16) provided also with an axial groove (14) cut on one side, many annular concave grooves (17) and annular convex parts (18) fitting them are formed respectively in the fitting parts of the small diameter tube (15) and large diameter tube (16) so that the length of the auxiliary winding shaft may be adjustable and a winding chain (25) is hung on a chain wheel (24) secured to one end of the auxiliary winding shaft (3) and engaging holes (26) for said winding chain (25) are made as opposed to the chain (25) on the lower surface of the supporting case (1).

United States Patent [191 Takazawa [451 Feb. 5, 1974 DOUBLE CURTAINDEVICE [76] Inventor: letsugu Takazawa, Bancho Habitation 901, 3,Sanbancho Chiyoda-ku, Japan 22 Filed: Jan. 15,1973

21 Appl. No.: 323,363

[30] Foreign Application Priority Data Apr. 24, 1972 Japan 47/47543 [52]US. Cl 160/120, 160/237, 160/250, 160/263 [51] Int. Cl E06b 9/08, E06b9/20 [58] Field of Search..... 160/86, 120, 237, 250, 263, 160/323, 324,325, 326, 85

Primary ExaminerMervin Stein Assistant Examiner-Philip C. KannanAttorney, Agent, or Firm-John C. Holman et al.

[ ABSTRACT A double curtain device wherein a curtain (5) provided withpunched patterns (29) is connected at the respective ends with a mainwinding shaft (2) and auxiliary winding shaft (3) both rotatablyprovided between right and left supporting cases (1), a balance weightshaft (8) is inserted and held in a folded part (7) of the curatin (5)so as to tension the curtain (5), a joint (9) is slidably fitted to themain winding shaft (2) so that the length of the main winding shaft (2)may be adjustable, said auxiliary winding shaft (3) is formed by fittinga small diameter tube (15) provided with an axial groove (14) cut on oneside into a large diameter tube (16) provided also with an axial groove(14) cut on one side, many annular concave grooves (17) and annularconvex parts (18) fitting them are formed respectively in the fittingparts of the small diameter tube (15) and large diameter tube (16) sothat the length of the auxiliary winding shaft may be adjustable and awinding chain (25) is hung on a chain wheel (24) secured to one end ofthe auxiliary winding shaft (3) and engaging holes (26) for said windingchain (25) are made as opposed to the chain (25 on the lower surface ofthe supporting case (1) 1 Claim, 7 Drawing Figures if ,llJHL-IHHHHMLUHI3F :4 3 f5 1'? 1'7 1 l i l l i I] 29 i i i t PAIENIEDFEB M I v 3.789.904

SHEET 1 BF 3 FIG.I

PAIENIEU FEB 5 I974 SHEET 2 BF 3 FIG.3

FIG.2

FIG.4

PAIEMEB FEB 5 I974 SHEET 3 BF 3 DOUBLE CURTAIN DEVICE This invention isa double curtain device wherein proper punched patterns for ventilationare formed in a curtain made to be wound up in both end parts withwinding shafts so as to be of a double formation in the suspended part.

An embodiment of the present invention shall be explained in detail withreference to the drawings in which:

FIG. 1 is a vertically sectioned elevation with a part omitted:

FIG. 2 is a vertically sectioned side view of the same;

FIG. 3 is a vertically sectioned side view showing a main winding shaft;

FIG. 4 is a perspective view showing a joint;

FIG. 5 is a partly sectioned perspective view showing a fitting part ofanauxiliary winding shaft;

FIG. 6 is a partly sectioned elevation showing a supporting case;

FIG. 7 is a bottom view of FIG. 6.

As shown in FIGS. 1 and 2, a main winding shaft (2) and auxiliarywinding shaft (3) are rotatably horizontally set in supporting cases(1), fitting concave grooves (4) extended in the axial direction areproperly made on the peripheral surface of the main winding shaft (2), acurtain (5) is fitted to the main winding shaft (2) by inserting andfitting a wire (6) on which the curtain (5) is wound at one end into thefitting concave groove (4) and is fitted at the other end to theauxiliary winding shaft (5) and a balance weight shaft (8) provided witha flange at each end is inserted into a folded part (7) of the curtain(5) wound at both ends so as to tension the curtain (5).

The above mentioned main winding shaft (2) is divided into two parts inthe middle in the axial direction and both parts are connected with eachother through a joint (9) for adjusting the length. As shown in FIGS. 2and 4, in said joint (9), a pair of sliders (12) provided with a bentpiece (10) on each side, having an engaging piece (11) in one end partand slidable within the main winding shaft (2) are connected with eachother by leaving a proper clearance between them through adjusting setscrews (13) so that, when the clearance between both sliders (12) isexpanded by adjustingthe adjusting set screws (13), the bent pieces (10)may be pressed against the inner peripheral surface of the main windingshaft (2) to connect and fix the divided parts of the main winding shaft(2) with each other.

As shown in FIGS. (1) and (5), the auxiliary winding shaft (3) is formedby fitting a small diameter tube provided with an axial groove (14) cuton one side into a large diameter tube (16) provided also with an axialgroove (14) cut on one side, annular concave grooves (17) are providedat proper intervals on the outside peripheral surface of the fittingpart of the small diameter tube (15), annular convex parts (18) fittingthe above mentioned annular concave grooves (17) are provided to projecton the inside peripheral surface of the fitting part of the largediameter tube (16) and the annular concave grooves (17) are properlyfitted to the annular convex parts (18) by a spring action through theabove mentioned cut axial grooves (14) to freely adjust the length.

Further, as shown in FIG. 1, an adjusting rod (19) connected with theflange is adjustably inserted and fitted in the balance weight shaft. Asin the above, the lengths of the main winding shaft (2), auxiliarywinding shaft (3) and balance weight shaft (8) are made adjustable inresponse to the fitting position of the curtain (5). Next, as shown inFIGS. 1 and 6, within one supporting case (1) supporting the mainwinding shaft (2), a winding rope (21) is hung on the projecting end ofthe main winding shaft (2) through a rope pulley (20), a pair ofengaging pawls (22) are swingably provided closely to the winding rope21). Said engaging pawl (22) is formed arcuately and has engaging teeth(23) in the free end part to engage the winding rope 21) in any positionso that, at the time of winding up the winding rope (21), the engagingpawl may swing downward due to its own weight to disengage the rope butnormally the engaging teeth (23) may bite into the winding rope (21) andmay engage and fix the rope by holding it with one side of thesupporting case (1). On the other hand, a winding chain (25) is hung onthe projecting end of the auxiliary winding shaft (3) through a chainwheel (24) in the same manner as is mentioned above and engaging holes(26) are made as opposed to the chain on the bottom surface of thesupporting case (1) so that the winding chain (25 that is, the auxiliarywinding shaft (3) may be engaged in any position.

As shown in FIG. 7, each of the above mentioned engaging holes (26) hasan engaging groove (27) directed inward so that a connecting neck part(28) of the winding chain (25) may engage the groove (27).

Punched patterns (29) are formed in the curtain (5) so as to beoverlapped to form through hole parts by the overlapping state of thecurtain (5).

Now the operation of the present invention shall be explained. Thecurtain (5) wound on the main winding shaft (2) is properly wound upthrough the winding rope (21) so that the suspended length of thecurtain may coincide with the height of the window frame (notillustrated).

In the case of changing the ventilating and lighting state by making thepunched patterns (29) of the curtain (5) coincide with each other, theauxiliary winding shaft (3) is rotated through the winding chain (25)for the slight adjustment of the punched patterns. That is to say, whenthe suspended length of the curtain (5) varies unfavorably if thepunched patterns (29) are adjusted only by the winding of the'mainwinding shaft (2), the auxiliary winding shaft (3) is adjusted androtated to adjust the suspended length together with the patterns.Needless to say, it is possible as mentioned above to adjust the lengthsof the main winding shaft (2), auxiliary winding shaft (3) and balanceweight shaft (8) in response to the width of the curtain (5) or fittingwindow frame.

In short, in the present invention, a curtain (5) provided with punchedpatterns (29) is connected at the respective ends with a main windingshaft (2) and auxiliary winding shaft (3) both rotatably providedbetween right and left supporting cases (1), a balance weight shaft (8)is inserted and held in a folded part (7) of the curtain (5) so as totension the curtain (5), a joint (9) is slidably fitted to the mainwinding shaft (2) so that the length of the main winding shaft (2) maybe adjustable, said auxiliary winding shaft (3) is fonned by fitting asmall diameter tube (15 provided with an axial-groove (14) cut on oneside into a large diameter tube (16) provided also with an axial groove(14) cut on one side, many annular concave grooves (17) and annularconvex parts (18) fitting them are formed respectively in the fittingparts of the small diameter tube (15) and large diameter tube (16) sothat the length of the auxiliary winding shaft may be adjustable, awinding chain (25) is hung on a chain wheel (24) secured to one end ofthe auxiliary winding shaft (3) and engaging holes (26) for said windingchain (25) are made as opposed to the chain (25) on the lower surface ofthe supporting case (1). Therefore, it is simply possible to adjust thelengths of the main winding shaft (2) and auxiliary winding shaft (3) inresponse to the size of the curtain or window frame, the fittingoperation on the spot is easy and the punched patterns of the curtain(5) can be very favorably adjusted by operating the auxiliary windingshaft (3) and without changing the length of the entire curtain (5).

What is claimed is: 1. A double curtain device wherein a curtainprovided with punched patterns is connected at the respective ends witha main winding shaft and auxiliary winding shaft both rotatably providedbetween right and left supporting cases, a balance weight shaft isinserted and held in a folded part of the curtain so as to tension thecurtain, a joint is slidably fitted to the main winding shaft (2) sothat the length of the main winding shaft may be adjustable, saidauxiliary winding shaft is formed by fitting a small diameter tubeprovided with an axial groove cut on one side into a large diameter tubeprovided also with an axial groove cut on one side, many annular concavegrooves and annular convex parts fitting them are formed respectively inthe fitting parts of the small diameter tube and large diameter tube sothat the length of the auxiliary winding shaft may be adjustable, awinding chain is hung on a chain wheel secured to one end of theauxiliary winding shaft and engaging holes for said winding chain aremade as opposed to the chain on the lower surface of the supportingcase.

1. A double curtain device wherein a curtain provided with punchedpatterns is connected at the respective ends with a main winding shaftand auxiliary winding shaft both rotatably provided between right andleft supporting cases, a balance weight shaft is inserted and held in afolded part of the curtain so as to tension the curtain, a joint isslidably fitted to the main winding shaft (2) so that the length of themain winding shaft may be adjustable, said auxiliary winding shaft isformed by fitting a small diameter tube provided with an axial groovecut on one side into a large diameter tube provided also with an axialgroove cut on one side, many annular concave grooves and annular convexparts fitting them are formed respectively in the fitting parts of thesmall diameter tube and large diameter tube so that the length of theauxiliary winding shaft may be adjustable, a winding chain is hung on achain wheel secured to one end of the auxiliary winding shaft andengaging holes for said winding chain are made as opposed to the chainon the lower surface of the supporting case.